O **FastAPI** é todo baseado nesses type hints, eles oferecem muitas vantagens e benefícios.

Mas mesmo que você nunca use o **FastAPI**, você se beneficiaria de aprender um pouco sobre eles.

/// note | Nota

Se você é um especialista em Python e já sabe tudo sobre type hints, pule para o próximo capítulo.

///

## Motivação { #motivation }

Vamos começar com um exemplo simples:

* Hacer una **pregunta** o preguntar sobre un **problema**.
* Sugerir una nueva **funcionalidad**.

**Nota**: si lo haces, entonces te voy a pedir que también ayudes a otros. 😉

## Revisa Pull Requests { #review-pull-requests }

Puedes ayudarme a revisar pull requests de otros.

Entonces, declara tus *path operation functions* con `async def` así:

```Python hl_lines="2"
@app.get('/')
async def read_results():
    results = await some_library()
    return results
```

/// note | Nota

Solo puedes usar `await` dentro de funciones creadas con `async def`.

///

---

/// note
Here goes a note
///

To translate it, keep the same line and add the translation after a vertical bar.

For example, if you were translating to Spanish, you would write:

/// note | Nota

Some examples in Spanish:

Source (English):

/// tip

Result (Spanish):

/// tip | Consejo

Source (English):

/// details | Preview

Result (Spanish):

En este caso, es una función `async`.

---

También podrías definirla como una función normal en lugar de `async def`:

{* ../../docs_src/first_steps/tutorial003_py310.py hl[7] *}

/// note | Nota

Si no sabes la diferencia, Revisa la sección [Async: *"¿Tienes prisa?"*](../async.md#in-a-hurry).

///

### Paso 5: retorna el contenido { #step-5-return-the-content }

     * elements.
     *
     * <p><b>Warning:</b> this may have unexpected results if a backing set of this view uses a
     * nonstandard notion of equivalence, for example if it is a {@link TreeSet} using a comparator
     * that is inconsistent with {@link Object#equals(Object)}.
     */
    public ImmutableSet<@NonNull E> immutableCopy() {

```JSON
{
    "message": "Hello World",
    "root_path": "/api/v1"
}
```

/// tip | Consejo

Nota que incluso aunque estés accediendo en `http://127.0.0.1:8000/app`, muestra el `root_path` de `/api/v1`, tomado de la opción `--root-path`.

///

* `Field(primary_key=True)` le dice a SQLModel que `id` es la **clave primaria** en la base de datos SQL (puedes aprender más sobre claves primarias de SQL en la documentación de SQLModel).

     *
     * @return the session data, never {@code null}
     */
    @Nonnull
    SessionData getData();

    /**
     * Default implementation at {@link ProtoSession} level, as the notion of project
     * does not exist there.
     */
    @Nonnull
    default Map<String, String> getEffectiveProperties() {
        return getEffectiveProperties(null);
    }

    /**

eyes, but it said nothing.

  `Perhaps it doesn't understand English,' thought Alice; `I
daresay it's a French mouse, come over with William the
Conqueror.'  (For, with all her knowledge of history, Alice had
no very clear notion how long ago anything had happened.)  So she
began again:  `Ou est ma chatte?' which was the first sentence in
her French lesson-book.  The Mouse gave a sudden leap out of the